Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 339
rmed. If the arc betoo long, the resistance is increased and the current lowered sothat the pull of the solenoid is weakened and the gap reduced. 2,430 HAWKINS ELECTRICITY Ques. On what kind of circuit is the series feed used? Ans. On constant pressure circuits only. O^es. Describe the shunt feed… … 5HUMT l-SOUNOlb(ACTS TO CLOSE) SUPPORT Fig. 3,339.—Elementary differential control lamp; this is a combination of a series and ashunt lamp. The differential action is the resultant due to the difference between theforce due to the series solenoid, tending to separate the carbons, and forces due to…
Electrical engineering
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